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论述了天津永定新河特大桥桥梁结构选型、总体布置、结构特点、抗震设计及施工方法等问题。指出跨径100～300m范围内,矮塔斜拉桥相对连续梁具有更好的耐久性、使用性及景观效果;在矮塔斜拉桥结构参数设计方面,推荐采用高塔型矮塔斜拉桥;针对永定新河特大桥特定设计条件,对桥梁进行了减隔震设计,大大提高了结构的抗震性能,节约了工程造价。同时综合比选各种施工方法,确定了主梁采用一次成形、不设置合龙块的支架法施工。
Discusses Tianjin Yongding New River Bridge Bridge structural selection, the overall layout, structural characteristics, seismic design and construction methods and other issues. It is pointed out that the short-span cable-stayed bridge has better durability, usability and landscape effect in the span of 100 ~ 300m. In terms of the structural parameter design of the short-pylon cable-stayed bridge, According to the specific design conditions of Yongding New River Super Major Bridge, the seismic isolation design of the bridge is carried out, which greatly improves the seismic performance of the structure and saves the construction cost. At the same time, a comprehensive comparison and selection of various construction methods to determine the main beam using a forming, not set the drag block stent method construction.